A.2x | B.O | C.-2 | D.-1 |
A.(a+b)2=a2+b2 | B.(a-b)2=a2-b2 |
C.(x+2)(x-2)=x2-2 | D.(-3a+2)(-3a-2)=9a2-4 |
A.3c-2b,3c-2b | B.3c+2b,3c+2b |
C.2b-3c,2b+3c | D.2b-3c,2b+3c |
A.(-3a+4b)(-4b+3a) | B.(a-b+c)(-a-b+c) |
C.(x-y-1)(-x+y+1) | D.(m+n-1)(2m-n+1) |
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